ixxx DESCRIPTIVE REMARKS. " 
Devonian, a marine series, containing Corals, Mollusca, and Trilodites, 
bearing a Silurian aspect. 
The great and important CarponrrEnrovs formation at its lower and 
central portion is composed of marine strata with numerous Corals, 
Crinoids, and Mollusca, especially Brachiopods and Cephalopods; but 
few forms of 7Jrilobites pass into this formation with which they en- 
tirely cease. sh remains are plentiful in ‘the Limestone belonging 
chiefly to the Placoids. The upper portion of this formation is charac- 
terised by an abundant terrestrial F/ora, the remains of which consti- 
tutes the valuable Coal seams. 
The uppermost group of the Poleozoic strata, that of the Permian, 
completes the series; in these deposits the Mauna and Flora, although 
presenting certain peculiarities and many specific differences to that of 
the Carboniferous, are apparently but a continuation of that varied 
and extensive series of strata. 
In concluding this volume, we again quote the eloquent author of 
Siluria* in the following expressive passage: We have here ‘‘a His- 
tory of those types of former life which by the labours of Geologists 
have been found to occupy distinct stages in the oldest deposits com- 
posing the crust of the earth. In all this there is no theory but 
simply an accumulation of positive data. The order of such successive 
generations is indeed much more clearly proved than many a legend 
which has assumed the character of history in the hands of man ; for 
the Geological record is the work of God.” 
* Siluria, 4th edition, p. 476. 
